Speed-control device.



H. VI. BAKER, JR

SPEED CONTROL DEVICE.

.APPLICATION man APn.6.1914.

Patented Sept. 11, 1917.

*2 SHEETS-SHEET 1.

H. M. BAKER, Jn. SPEED co'NTRoL DEVICE.v APPLICAUGN FILED-APIH.` 6". 1914.

2 SHAEETS-SHEET 2.

. 1.239,?58. Patentedsept. 11,191?.

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HAYIDN IVI. BAKER, JR., OF BROOKLYN, NEW YORK, ASSIGNOR TO AUGUSTUS TREADWELL, JR., OF BROOKLYN, NEW YORK.

To all whom it may concern:

Be it known that I, HAYDN M. BAKER, Jr., a Citizen of the United States, and resident of Brooklyn, in the county of Kings andA 'State `of New York, havefinvented certain newv and useful Improvements in Speed-l Control Devices, of which the following is a specication.

This invention relates to gearing for a speed control device and more particularly ,to an improvement in the mechanism shown to provide a construction in which the ac curacy of the instrument is not affected by the continued use thereof.

A further object of the invention is to pro vide means whereby theinstrument may be readily'. and accurately adjusted to effect the driving connection at different speeds.

With the above and other `objects in veiw, which will hereinafter appear, my invention consists of the construction hereinafter described and shown in the accompanying drawings, whereinj Figures 1 and 2 showthe mechanism in longitudinal section each view being at right angles to the other;

Fig. 3 is a longitudinal section similar to Fig. 1 showing the central parts in section;

Fig. 4 is a sectional view on line 4 4 of Fig. '3; and

Fig. 5 is a sectional view on line 5-5 of Fig. 3. i

Referring now to the drawings 1 indicates the casing of the device which may be of any suitable configurationand of sufficiently rigid construction to support the cooperating parts. Vorking in suitable bearings in the end plates of the casing isthe driving shaft 2 of the device which for convenience I have shown with a pin on its projecting end for y SPEED-CONTROL DEVICE.

i Specification of Letters Patent. Patented Sept, 11, 1917., Application filed April 6, 1914. Seria1NoQ829,779. i p

power. The `other end of the shaft is supported in a ball thrust bearing whose stationary part 3 is adjustably seated in the end plate of the casing. Attached to the .shaft near its projecting end is a worm 4 meshing with a worm wheel 5 mounted for free rotation on a transverse shaft 6 supported above the shaft 2 in the side walls of the casing. The end of the shaft 6 projects through the wall of the casing whereby it may be connected by suitable gearing 6*L or otherwise to asignal or other device which it is desired to operate when the shaft 2 attains the predetermined speed. Attached to the worm wheel 5is a bevel gear 7 which meshes with a bevel gear 8 supported on an axle set radially between the hub and the rim of a stop wheel 9, the hub of which is also free to rotate on the shaft 6. Meshing with 'shaft 6 will be operated directly from the shaft 2 'through the reducing worm 4.

As in my prior patent I provide a centrifugally controlled device for locking the stop wheel 9 at the desired speed. This centrifugal mechanism has `been greatly improved in my present device and comprises a cross-head 11 attached to the shaft 2 immediately beyond its thrust bearing and provided with oppositely extended pairs of arms `between which are pivoted the centrifugal governor weights 12. The supporting levers of the weights12 are each provided with an inward extension or bellcrank arm 13 having` in its inner face near its free end a socket 14 for a bearing ball 15. Set loosely in the sockets 14 with their ends lresting against `the bearing balls are thrust rods 16 whose upper ends project into similar ball sockets in the lower face of a crosshead 17 formed on a sleeve 18 carried by the shaft 2 and free to both slide `androtate thereon. The cross-head 17 is provided with a flange 19 whose thrust is `transmitted through va suitable bearing the stationary part of which engages with itsV upper face a pair of balls 21 set in sockets on the under face of` a thirdcrossfhead 22 surrounding'the sleeve 18 but clear ofthesleeveto permit aV limited transverse movement of the yoke as will now be described.

The cross-head 22 lis provided withoppositely projecting armsfhaving ears at rtheir extremities which provid'ebearings .for opscrew whose end projects through a fbQre inthe wall of the casing, and is .provided with an adjusting .nut 28 whereby the screw and spring may be adjusted longitudinally.

yIt is rnecessary .for the bushing or sleeve 18 to revolvein unison with the shaft 2, and

yet be perfectly free to slide longitudinally thereon.` Any friction arising from the contact of the rotating sleeve with any .non-rotating' parts of the apparatus, must be overf colnein some manner yby a connection `between :the sleeve or bushing 18 and the shaft 2, in order to transmit a rotating motion to the sleeve 18 as stated.

If the ordinary method yof using a ikey, seated in the` shaft and tting .a `:keyway in the bushing, or a pinqin the shaft fitting slidably in a slot in the bushing be used, then the effort of the key or pin to transmit rotation from the shaft-2 to the sleeve 18 will produce a pressure between the point of contact of the key `or ,pin .with the bushing 18 and `also between vone `side of the :bushing 18 andthe shaft 2, resulting in a static friction' which must be overcome by the centrifugal parts before the endwise motion 4can takefplace. It has not been found practicable .to` eliminate .this in part by the use of two yoppositely located keys or pins, and even if it were, some sliding friction would y remain. I eliminate this static friction by connecting the shaft 2 and sleeve 18 for rotation in the following manner.

The sleeve 18 is fitted with asmall yoke 29 which is suspended freely upon two pins located AinI twooppositely situated hubs, on

sleeve 18.. This yoke 29 has two pins 30 projecting, one at each end, longitudinally at ninety here@ te its Suspension nin sur ports; `It isable to swivel slightly upon its support-p4 pins. A

In, assemblies; the sleeve 18 with ire'yoke 29 is slid upon the shaft 2 and Vcross-head or weight .carrie-r lil is pushedy Aonto the shaft to its proper position, adjacent the sleeve 18, and its retaining pin driven vthrough it and the shaft =2.

The -belle'ranfk weight arms are now inserted lin the open ends of the `carrier 11 and the lpivot pins for the weights inserted i 1 such a manner that one end lof each pin y"projects from opposite sides of "the carrier 11.- v.Uren each rraitne rin iS slipped 2L link 81, the free end of which hooks over a projecting pin 3() `of the yoke 29,v A small spring is .used .on each pin orI yoke 29 to hold link .31 down to positionwhich is determined by a Small cross pin as shown.

It will new he seen .that a'rotatzion of the shaft '2 in the ,direction .of dragging both linksl will tend toswvel the yoke 29h; the direction of rotation at each of its ends, bjut `this cla'rliIlOL be as ,the yoke 29 `is in itself rigid and is suspendedfrom trunnion pins in its plane of rotation with sleeve 118.

It will be seen ythat a force tending to re-` Y tard ,the rotation of the sleeve 18 with its Shaft 2 will be transmitted through the trunnion pins `of the yoke,-to the'yoke and through the pins 30 thereof, to links 31, and thence to :the weight pivot pinsJ in carrier 11, and so to the shaft. The pressure upon the two pins 30 of the yoke 29, where they enter the holes `in thelinks 131 will beV equal, because if there should be imperfect fitting the yoke 29 Will .rotate upon its pins slightly and cause the pressure to be equalized beh-.veen its' two pins, and the outer ends .of the holes in the ends of ythe links 31.

rlhe effect of this is, therefore, to produce a balanced force of rotation upon the sleeve 18, without side pressure upon the shaft, the

sleeve 18 being free to move endwise uponY the shaft .2 to theeXtent desired.` In moving forward the sleeve 18 causes the links 31 to raise at theirv outer ends slightly, and in doing this the sleeve 18 is forced to rotate very slightly `uponfthe shaft 2 in the direction of rotation, which action aids' in over@ Coming the friction of :rest between theisleelve 18 and the shaft -2 with relationtoits endwise movement.

In centrifugal governors as heretofore constructed, the governorl weights Awere allowed a-considerable range ,of motion, whereby their center of mass are at a greater` distance from the `center of rotation at the higher speeds than at the lower speeds. Thisfis` particularly noticeable ineffect with governors which are nearly isochronous,`

where y a slight accession of speed would cause thegovernor'weights to fly out to a relatively great distance, lcalling for a considerableI reduetionin speed to bring them to their normal position, and often resulting in bhunting/ i '.In `:my present construction I guard against this defect by limiting the movement of the weights to an amount justsuiflcient to bring the stop pawl intothe range of the teeth or pins on the stop wheel. The end of the sleeve 18 is projected through the cross-head of the saddle 22 into close proximity with the adjacent face of the worm 4: whereby'when the sleeve has been moved a slight distance on the shaft, it will be stopped by engagement with the worm, and the further pressure of the weights will be taken up between the weight carrying frame 11 and the worm 4. i

Owing to this limitation in the movement of the weights they revolve with a nearly uniform radius of rotation, allowing the critical speed of the device to be directly and accurately varied by adjusting the tension of the control spring 26. i

'Furthen the instrument is very sensitive as regards the release of the stop pawl with its tooth, as the speed decreases, below the critical point, when the governor weights are free to retire from their actuating position,they not having obtained an eXtreme position of throw even if subject to a great excess of speed, and are consequently ready to retire at the proper reduction of speed. The hard polished surfaces of the teeth in the stop wheel and the pawl in the yoke interpose but little friction in the process of retirement of the pawl, even when under considerable pressure.

It will be noted that the mechanism is constructed throughout to eliminate friction and binding of the engaging parts. The thrust rods between the lever arms of the weights and the cross-head of the sleeve 18 are smaller than their sockets so as to permit free relative angular movement in all directions. Further as the rods are free at each end, each weight is free to produce its full pressure independent of the throw of the opposite ball or weight, its motion not being restricted as it would be by a link such as used in prior constructions.

The ball bearing between the sleeve 18 and the cross head 22 minimizes the friction of rotation between these parts and the balls in the face of the cross-head relieves all friction due to the angular motion of the yoke 23.

I have shown and described a construction using only two weights but it will be understood that the number of weights may be increased as desired by merely adding suitable connections to the frame 11. It will also be understood that the device may be made reversible by providing a second gear device to be locked when the speed of the shaft falls below the desired critical speed, and that various other changes may be made in the construction and proportion of the parts without departing from the spirit of my invention.

Having thus described my invention, what I claim and desire to secure by Letters Patent is l. The combination in a speed control device, of a rotatable shaft, centrifugal weights carried thereby, a sleeve surrounding said shaft, connections between said sleeve and said weights for effecting longitudinal movement of said sleeve upon centrifugal movement of said weights, a stop member actuated by longitudinal movement of said sleeve, a secondary shaft extending in an axial line to said main shaft a rotatable member mounted thereon, adapted to be engaged by said stop member, and gearing including a planetary gear for connecting and disconnecting said rotatable member with said main shaft, and a stop attached to saidshaft for limiting the movement of said sleeve.

2. The combination in a speed control device, of a rotatable shaft, a cross head attached to said shaft, centrifugal weights pivotally mounted in said cross head, a sleeve to rotate and slide on the shaft connections between said weights and said sleeve for effecting an end-wise movement of said sleeve upon centrifugal movement of said weights, and an equalizing connection between said cross head and Said sleeve for transmitting 95 the rot-ary motion of said cross head to said sleeve.

3. The combination in a speed control device,of a rotatable shaft, a cross head attached to said Shaft, centrifugal weights piv- 100 otally mountedin said cross head, a sleeve to rotate and slide thereon, connections between said weights and Said sleeve for effecting an end-wise movement of said sleeve upon centrifugal movement of said weights, 105 an equalizing connection between said cross head and said sleeve for transmitting the rotary motion of said cross head to said sleeve, comprising a yoke pivoted on said sleeve and having rigid longitudinal pins connected 110 thereto and links connecting said ends with the opposite sides of said cross head.

11. The combination in a speed control device, of a rotatable shaft, a cross head attached thereto, centrifugal weights carried by said cross head, a sleeve mounted onsaid shaft and free to move end-wise thereon, means for shifting said sleeve comprising bell crank arms carried by said weights, and thrust rods between said arms and a ange of said sleeve, said rods being loosely seated at each end in sockets in said arms and flange respectively.

5. The combination in a speed control device, of a rotatable driving shaft, a driven shaft, a worm gear attached to said driving shaft for driving said driven shaft, a sleeve mounted for longitudinal movement on said driving shaft, centrifugal mechanism for actuating said sleeve, means controlled by said sleeve, including a secondary shaft extending in an axial line to said main shaft, a rotatable member mounted thereon, and gearing, including .a planetary gear, for `connecting and disconnecting said rotatable membei` with said main shaft, said worm ,gear being positioned on said shaft to prevent movement ofsaid sleeve in excess of its operative movement.

y6j. The combination in a speed control device, of a rotatable driving shaft., a driven shaft, a worm gear attached to said driving shaft for driving said driven shaft, a sleeve mounted for longitudinal movement on said driving shaft, centrifugal mechanism for actuating said sleeve, means controlled by said sleeve for .effecting operative connection between said driving and driven shafts, comprising a yoke pivotally-mounted adjacent said sleeve having arms extending on each side thereof, a `cross head pivotally connected to the Varms of the yoke and having' an enlarged `bore surrounding said sleeve and flange on said sleeve, and an intermediate member between said cross head and said ange having an anti-friction bearing nor and the .said Vstop rmechanism* and independent of the said :driving member toeliminate stati-c friction. .8, Ina speed Ycon-trol .de vice,` Vtheicombination of a driving shaftya driven shaft, rpermanently intermeshing gears connecting the said shafts with `each other and means for operatively disconnecting thesame including a stop wheel, a governor rotating with the said driving shaft, a stop device for the said stop wheel, and an operative connection between the'said governor and the said stop device and including a sleeve loosely mounted on the said driving :shaft t0 slide and .to turn thereon, and toeli-minate static fric-tion.

9. Ina speed control device, the combination of a driving shaft, a driven shaft, permanently intermeshing gears connecting the said shafts with each other, and lmeans for operatively disconnecting the same including a stop wheel, a governor Vrotating with the said driving shaft, a stop device for the said stop Wheel, an operative connection between the said governor and the `said stop device including a Y.sleeve loosely mounted on the said driving shaft toslide and to turn thereon, and means to limit thesliding movement ofthe said sleeve andthereby the centrifugal action of the'said governor.

Signed at New York in the county of New York and State of New York this QSthday of March, 1914.

Y HAYDN M.QBAKER JR.

Witnesses: i

W. B. Mon'roN, LE. JOHNSTON.

Copies of this patent may be obtained for five cents each, by addressing-the Commissioner of retenu,

Washington, D. C. 

